* feat: Add SSH key authentication and custom port support
- Add SSH key authentication support with three modes: password, key, or both
- Add custom SSH port support (defaults to 22)
- Create SSHKeyInput component with file upload and paste modes
- Update database schema with auth_type, ssh_key, ssh_key_passphrase, and ssh_port columns
- Update TypeScript interfaces to support new authentication fields
- Update SSH services to handle key authentication and custom ports
- Update ServerForm with authentication type selection and SSH port field
- Update API routes with validation for new fields
- Add proper cleanup for temporary SSH key files
- Support for encrypted SSH keys with passphrase protection
- Maintain backward compatibility with existing password-only servers
* fix: Resolve TypeScript build errors and improve type safety
- Replace || operators with ?? (nullish coalescing) for better type safety
- Add proper null checks for password fields in SSH services
- Fix JSDoc type annotations for better TypeScript inference
- Update error object types to use Record<keyof CreateServerData, string>
- Ensure all SSH authentication methods handle optional fields correctly
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